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Title: High-pressure U[subscript 3]O[subscript 8] with the fluorite-type structure

Authors:
; ; ; ; ; ;  [1];  [2]
  1. Michigan
  2. (
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
DOE - BASIC ENERGY SCIENCES
OSTI Identifier:
1123177
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 213
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Zhanga, F. X., Lang, M., Wang, J. W., Li, W. X., Sun, K., Prakapenka, V., Ewing, R. C., and UC). High-pressure U[subscript 3]O[subscript 8] with the fluorite-type structure. United States: N. p., 2014. Web. doi:10.1016/j.jssc.2014.02.012.
Zhanga, F. X., Lang, M., Wang, J. W., Li, W. X., Sun, K., Prakapenka, V., Ewing, R. C., & UC). High-pressure U[subscript 3]O[subscript 8] with the fluorite-type structure. United States. doi:10.1016/j.jssc.2014.02.012.
Zhanga, F. X., Lang, M., Wang, J. W., Li, W. X., Sun, K., Prakapenka, V., Ewing, R. C., and UC). Thu . "High-pressure U[subscript 3]O[subscript 8] with the fluorite-type structure". United States. doi:10.1016/j.jssc.2014.02.012.
@article{osti_1123177,
title = {High-pressure U[subscript 3]O[subscript 8] with the fluorite-type structure},
author = {Zhanga, F. X. and Lang, M. and Wang, J. W. and Li, W. X. and Sun, K. and Prakapenka, V. and Ewing, R. C. and UC)},
abstractNote = {},
doi = {10.1016/j.jssc.2014.02.012},
journal = {Journal of Solid State Chemistry},
number = ,
volume = 213,
place = {United States},
year = {Thu Aug 14 00:00:00 EDT 2014},
month = {Thu Aug 14 00:00:00 EDT 2014}
}
  • A new high-pressure phase of U{sub 3}O{sub 8}, which has a fluorite-type structure, forms at pressures greater than ∼8.1 GPa that was confirmed by in situ x-ray diffraction (XRD) measurements. The fluorite-type U{sub 3}O{sub 8} is stable at pressures at least up to ∼40 GPa and temperatures to 1700 K, and quenchable to ambient conditions. Based on the XRD analysis, there is a huge volume collapse (>20%) for U{sub 3}O{sub 8} during the phase transition and the quenched high-pressure phase is 28% denser than the initial orthorhombic phase at ambient conditions. The high-pressure phase has a very low compressibility comparingmore » with the starting orthorhombic phase. - Graphical abstract: α-U{sub 3}O{sub 8} is in a layered structure with orthorhombic symmetry, at high pressures, it transformed to a fluorite-type cubic structure. There are a lot of defects in the cubic structure, and it is a new kind of hyperstoichiometric uranium oxide, which is stable at ambient conditions. - Highlights: • A new fluorite-type high-pressure phase was found in hyperstoichometric UO{sub 2}+x (x∼0.8). • The new high-pressure structure is quenchable to ambient conditions. • Pressure driven phase transition in orthorhombic U{sub 3}O{sub 8} was first found.« less
  • The corundum-type In{sub 2-2x}Zn{sub x}Sn{sub x}O{sub 3} solid solution (cor-ZITO, x {le} 0.7) was synthesized at 1000 C under a high pressure of 70 kbar. cor-ZITO is a high-pressure polymorph of the transparent conducting oxide bixbyite-In{sub 2-2x}Zn{sub x}Sn{sub x}O{sub 3} (x {le} 0.4). Analysis of the extended X-ray absorption fine structure suggests that significant face-sharing of Zn and Sn octahedra occurs, as expected for the corundum structure type. In contrast to the ideal corundum structure, however, Zn and Sn are displaced and form oxygen bonds with lengths that are similar to those observed in high-pressure ZnSnO{sub 3}. Powder X-ray diffractionmore » patterns of cor-ZITO showed the expected unit cell contraction with increased cosubstitution, but no evidence for ilmenite-type ordering of the substituted Zn and Sn. A qualitative second harmonic generation measurement, for the solid solution x = 0.6 and using 1064 nm radiation, showed that Zn and Sn adopt a polar LiNbO{sub 3}-type arrangement.« less
  • The corundum-type In{sub 2-2x}Zn{sub x}Sn{sub x}O{sub 3} solid solution (cor-ZITO, x {<=} 0.7) was synthesized at 1000 C under a high pressure of 70 kbar. cor-ZITO is a high-pressure polymorph of the transparent conducting oxide bixbyite-In{sub 2-2x}Zn{sub x}Sn{sub x}O{sub 3} (x {<=} 0.4). Analysis of the extended X-ray absorption fine structure suggests that significant face-sharing of Zn and Sn octahedra occurs, as expected for the corundum structure type. In contrast to the ideal corundum structure, however, Zn and Sn are displaced and form oxygen bonds with lengths that are similar to those observed in high-pressure ZnSnO{sub 3}. Powder X-ray diffractionmore » patterns of cor-ZITO showed the expected unit cell contraction with increased cosubstitution, but no evidence for ilmenite-type ordering of the substituted Zn and Sn. A qualitative second harmonic generation measurement, for the solid solution x = 0.6 and using 1064 nm radiation, showed that Zn and Sn adopt a polar LiNbO{sub 3}-type arrangement.« less